论文标题
在铁磁性Weyl半准二氧化碳中，各向异性抗性具有90度扭曲
Anisotropic resistance with a 90-degree twist in a ferromagnetic Weyl semimetal, Co2MnGa
论文作者
论文摘要
CO $ _2 $ MNGA是一种铁磁半学，其Weyl节点线由ARPES鉴定。我们研究了使用重点的离子光束从单晶体上切出的薄色Co $ _2 $ _2 $ mnga lamellae（10 $ \ times $ 10 $ \ times $ 0.4-5微米）。这些晶体表现出意外且高度不寻常的平面电阻各向异性（$ \ sim $ 10倍），主轴在上部和下面之间旋转90度。使用对称参数和仿真，我们发现观察到的电阻各向异性类似于具有各向异性表面状态的各向同性导体的抗性各向异性，这些状态会阻碍与散装状态的杂交。这些状态的起源正在等待进一步的实验，可以将表面带与观察到的90 $^\ Circ $ -Twist几何形状相关联。
Co$_2$MnGa is a ferromagnetic semimetal with Weyl nodal lines identified by ARPES. We studied electrical transport in thin Co$_2$MnGa lamellae (10 $\times$ 10 $\times$ 0.4-5 microns) cut from single-crystals using a focused ion beam. These crystals exhibit an unexpected and highly unusual planar resistance anisotropy ($\sim$10 times) with principal axes that rotate by 90 degrees between the upper and lower faces. Using symmetry arguments and simulations, we find that the observed resistance anisotropy resembles that of an isotropic conductor with anisotropic surface states that are impeded from hybridization with bulk states. The origin of these states awaits further experiments that can correlate the surface bands with the observed 90$^\circ$-twist geometry.
